Cutting head for suction dredgers



Ochs, 1929. P'. QATN WENEN* .1,730,958

cu'r'rmo HEAD Fox sucfioxffnnpsnns mea Nov. #26;A 192e jin/7M Patented Oct. 8, 1929 UNITED STATES PIETER VAN WIENEN, OF HAMBURG, GERMANY CUTTING HEAD FOR SUCTION DREDGERS Application filed November 26, 1928, Serial. No, 322,022, and in Germany October 12, 1927.

rilhere exist already cutting heads 'for suction dredgers having adjustable or rotatable bottom milling cutters sharpened at the two longitudinal. edges so that they are able to cut in two directions. The cutting heads are provided with means tor reversing said cutw ters. These latter are supported in the ends of spokes so that the bottom material taken up is conveyed into the open cutting head trame whence it is conveyed further by means of the cutters directly to the suction pipe. This entails, however, the drawback that the hinge joints of the cutters are very quickly worn oli.

In order to obviate this drawback, the bottom milling cutters are, according to my invention, arranged at the circumference ot a closed casing, to which preliminary cutters or cutting knives are attached between the adjustable main bottom cutters, and within which toothed arms are attached to the axles of said bottom cutters, these arms engaging a toothed disk, preferably ot triangular shape, secured to the driving shaft.

The invention is illustrated diagrammatically and by way ot example on the accompanying drawing, on which Figure lis a vertical longitudinal section through a cutting head designed according to this invention; Figure 2 is a transverse section in the plane A-B of Fig. 1; Figure 3 shows a part ot said transverse section, the movable members being in another position; Figure t is a side view, showing the cutting head attached to a suction dredger; and Figure 5 is a front-view f of the lower part ot Fig. 4.

On the drawing, l (Figs. 1 and l) indicates the driving sha'tt for actuating the bottom milling cutters; it is supported upon the suction tube a (Fig. il) and driven by a reversing engine. The casing 3 ot the cutting head is arranged loosely on the shaft 1 sothat it can easily be turned thereon, and is provided with three radial extensions serving as supports or bearings tor three axles 5 which can be adjusted simultaneously and uniformly by transmitting members 2 and 4t (Figs. L3), of which 2 is affixed to the shaft l and can be actuated by it. The member 2 is practically triangular and its toothed carriers engage toothed inner ends of the transmitting members d which are firmly secured to said axles. Also the casing 3 is practically triangular; it carries, by the intermediary of the axles 5, the three main cutting knives (i, and is pro- 5 vided, besides, with auxiliary or preliminary cutting knives 7 which extend radially outwardly between the knives 6 in the manner shown particularly distinctly in Fig. 2.

The casing 3 which is, as has already been explained, arranged loosely upon the shaft A l is nevertheless rotated by it, in that the power is transmitted to it by means of the triangular member 3 which is aflixed to said shaft and the corners of which Contact with the casing wall in the manner shown in Figs. 2 and Instead of employing the casing wall as abutments, separate abutment members may be provided within the casing. The knives 6 and 7 are sharp at both edges and can, therefore, cut the ground in either direction of the cutting head. Each corner ot the triangular mcmber 2 can contact with the one or the other side of the appertaining extension of the casing, according to the direction of rotation of the shaft l, but prior to the actual happening of the three contacts between the mem ber 2 and the wall of the casing the arms 4Ll will be turned by the member 2, also the axles 5 will. thereby be turned, and the knives G will be correspondingly adjusted, that is to say, automatically adjusted according to the direction of rotation ot the shaft 1. Immediately thereafter the member 2 will contact with the wall of the casing and now this latter will be rotated and the knives will do their work. In Figs. 2 and 3 the two directions of rotation are indicated by arrows, and it is distinctly to be seen that the positions ot the movable parts 2, 4t and G are correspondingly different.

Particularly important and Valuable advantages presented by the above-described improved cutting head are the absolutely positive reversal of the main cutting knives 6 when the direction of rotation of the shaft l is reversed, and the provision ot the preliminary cutting knives 7 just in front of the acting; rutti ng edges of said knives 6.A

I elaiin:

l. A euttinghead iorsuetion dredgers,co1n prising, in combination7 a rotary easing arranged loosely upon the cutting head driving shaft, adjustable niain cutting knives attached to said easing, and preliminary outting` knives also attached to said easing.

2. A cutting head for suction dredgers, Comprising, in Combination, a rotary easing 10 arranged loosely upon the cutting head drivingl shaft7 adjustable niain cutting knives attached to said easing, and non-adjustable preliminary cutting knives extending radially forth from the said easing and being arranged in alternation With said niain knives.

3. A cutting head for suction dredgers, comprising, in combina-Lion, a rotary easing arranged loosely upon the cutting head driving shaft, adjustable niain Cutting knives attaehed to said Casing, Dreliniinary cutting knives also attach-ed to said Casing7 and mainknite reversing nieans arranged Within the said easing.

4f. A Cutting head for suction dredgers,

Comprising, in combination, a rotary easing arranged loosely upon the cutting head driving shaft and having radially directed eXtensiens7 adjustable inain cutting knives attached to said extensions, non-adjustable prelinlinary Cutting y knives extending radially forth roin said Casing between the extensions thereof, and automatically acting main-knife reversing ineans arranged Within the said easing and adapted to transmit power from said sli-att to the main cutting knives, substantial ly as set forth: 4

In testimony whereof az iny signature.

PIETER kum YJIENEN.

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